Quick Fix Proposals are available for the problems indicated with a light-bulb on the left vertical bar of the editor.

Place the editor cursor on the problem's line and
press Ctrl + 1, or
right-click and select
Source >
Quick Fix from the context menu.

The available quick fix proposals are shown in a pop-up list. Use the
Up and
Down arrows to select a quick fix, then press
Enter to apply it.

Tip: When there are more problems reported on the same line, the list aggregates all proposals. If you place the editor cursor inside a problem's highlight range (squiggle underline) the proposals for that particular problem are shown first.

Tip: You can also
right-click on an entry in the
Problems View and select
Quick Fix from the context menu.